The direct electrochemistry of ferritin compared with the direct electrochemistry of nanoparticulate hydrous ferric oxide

A Protein-Based Ferritin Bio-Nanobattery

“…During attempts to create such a small cell, different electrical properties were encountered than those observed for the bulk cell. Contrary to previous reports [13][14][15], purified ferritin in the presence of a clean gold electrode did not demonstrate the ability to rapidly oxidize or reduce the mineral core during cyclic voltammetry, as shown as the left curve in Figure 3. Electrochemical reactivity of redox proteins can be augmented by addition of chemical promoters, which catalytically facilitate electrochemical reactions [16].…”

“…When subjected to negative voltage cycling in the presence of Fe 2+ chelators, the Fe 3+ in the chemically attached holoferritin was reduced and the resulting Fe 2+ was immediately chelated forming apoferritin [14,15]. When this process was reversed in anaerobic buffer containing Fe 2+ and cycled in the oxidizing direction, holoferritin was once again formed [14].…”

Voltammetric Investigation of Iron(III) Interactions with Phytate

“…Natural occurrence of phytic acid, its complexation ability, and adsorptive properties are promising for the inhibition of corrosion processes, therefore numerous electrochemical studies of the corrosion inhibition effect of phytates are reported recently [33][34][35][36]. In a series of publications Marken and coworkers published electrochemical characterization of layer-by-layer (LBL) assembled iron phytate films [11,37,38]. Authors showed by electrochemical and AFM measurements that layers are well-defined and that iron phytate films are electrochemically active, able to exchange cations, and may act as an energy storage material.…”

The one-electron reduction of a multi-centred iron(III) polyoxometallate. A pulse radiolysis study

“…Therefore it is more difficult to reduce the pure Fe(III) clusters than those containing also Fe(II) [2][3][4][5][6][7][8]. These results prove the power of pulse-radiolysis as a tool to study single electron redox processes of multi-centre metal clusters.…”

“…According to this proposal a single electron reduction of the cluster forms a transient inter-valence Fe II -Fe III species. This kind of potential shift was already discussed in the literature regarding iron oxide clusters when comparing one iron centre vs. iron oxide clusters [2][3][4][5][6][7][8]. (It should also be noted that in cluster (1) all Fe(III) ions are equivalent, however in other Fe III n polyoxometalate clusters, where different types of Fe(III) centres exist, electrochemically separated waves may be observed [9].…”